Re: [APML] A couple of E200 piggyback shots

[Ray Butler <ray.butler@nuigalway.ie>]

Andy, that's a great start. The fisheye pic is awesome.

For your next shots, consider stopping the 105mm lens down to f4. That 
will remove the aberrations in the corners and reduce vignetting.

When I am testing out a lens, I usually take a series of sequential 
shots of the same field at f2 for 2 minutes, f2.8 for 4 minutes, f4 for 
8 minutes, f5.6 for 16 minutes (and possibly intermediate times, if 
there are half-stop clicks on the lens as well). This tests not only the 
lens' overall performance and the reduction in aberrations in the 
corners as it is stopped down, but also the reciprocity of the film in 
the centre of the field. So it's also a good opportunity to test a new film.

Ray "who believes that medium-format widefield lenses + E200 = great 
fun" Butler

Andrew Clegg wrote:

> In the spirit of "keep on posting," here are a couple of mine from last
> month. I shot these with a Pentax 6x7 piggybacked on my C14 CGE. I'm just
> beginning, so these shots aren't as spectacular as most I see on this forum,
> but it's fun learning! They were shot on E200 pushed 1 stop (by Penn Camera
> here in DC), and scanned by Tony Hallas over on the other coast. A small
> amount of processing was done in Photoshop.
> 
> Clear skies!
> Andy
> 
> http://www.w4je.com/ap0409.htm
> 
> 
> -----Original Message-----
> From: astro-photo-bounces@seds.org
> [mailto:astro-photo-bounces@seds.org]On Behalf Of Greg Hartke
> Sent: Thursday, October 21, 2004 7:08 PM
> To: Michael Barlow; Discussion of Film Astrophotography
> Subject: RE: [APML] To mount, or not (slide film) UPDATE
> 
> 
> 
> Hmm. I guess you're right. I automatically figured my shots were mediocre at
> best and until relatively recently there were enough of that class out there
> that no one needed to see mine, too. Now there's hardly anything to be seen
> in deep sky with film so I'll try to find the time to get these out there.
> Time is tough for me, though. I mentioned that I had film ready to be picked
> up this past Monday. Well it's still there. I hope to pick it up on
> Saturday. Processing takes time (at least it does for me) so it'll be a
> couple of weeks, anyway. Stay tuned.
> 
> Greg
> 
> -----Original Message-----
> From: astro-photo-bounces@seds.org
> [mailto:astro-photo-bounces@seds.org]On Behalf Of Michael Barlow
> Sent: Thursday, October 21, 2004 7:44 AM
> To: Discussion of Film Astrophotography
> Subject: Re: [APML] To mount, or not (slide film) UPDATE
> 
> The last week or so I seen a bunch of "film" shots scanned and posted,
> Here or in a Binaries group. I've been doing the Film thing for about a year
> and until very recently I had virtually nothing to compare my "film" shot's
> to what's possible with film. So if you still do Film, Please Post!, or as
> Alan said, " when you have something, ya gotta give."
> Michael A. Barlow
> 
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-- 
Dr. Ray Butler (ray.butler@nuigalway.ie || ray@physics.nuigalway.ie)
Lecturer, Dept. of Physics || Computational Astrophysics Laboratory
National University of Ireland, Galway, University Road, Galway, Ireland.
Tel: +353-91-524411 ext. 3788   FAX: +353-91-525700

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